How long to keep business records in Australia: the ATO's rules

The ATO’s record-keeping rule sounds like the simplest sentence in Australian tax: keep most records for five years. The complexity is in the start date, which is not the lodgment date, and in the long tail of records that must outlive the five years because the claims they support do. Everything below is sourced from ATO guidance in the Sources section.

The 5-year rule, and when the clock starts

Most records must be kept for 5 years, and the period generally runs from when you prepared or obtained the record, or completed the transactions or acts it relates to, whichever is later ^[1] . That start-date subtlety matters: a contract signed in 2024 but completed in 2026 starts its clock in 2026.

The ATO also ties retention to the period of review: records must be kept long enough to cover the review period of any assessment that uses them ^[2] . An amended assessment can therefore quietly extend a record’s required life.

Records that outlive five years

The 5-year minimum is exactly that. Categories that need longer ^[2] :

• Depreciating assets: the purchase invoice substantiates deductions across the asset’s effective life, then needs to survive the review period after the final claim.
• Capital gains tax records: acquisition documents for property, shares, and crypto substantiate cost base when the asset is eventually sold, which can be decades later.
• Disputed or amended assessments: anything feeding an open dispute stays.

The operating principle is simple to state: a record must outlive every claim that relies on it, not just the year it was created.

Format: electronic is fine, “true and clear” is the test

The ATO accepts records electronically or on paper ^[1] . Copies, including scans and photos, qualify when they are a true and clear copy of the original ^[1] . The practical reading for a small business: photograph the thermal-paper receipt before it fades, and the photo becomes the keepable record. Faded originals are one of the most common substantiation failures in reviews, and they are entirely preventable at capture time.

Language rules: records for expenses incurred in Australia must be in English; expenses incurred overseas can be kept in the local language, with a certified translation supplied if the ATO asks ^[1] .

What the ATO expects to see

The record set for a typical small business spans five families ^[1] :

• Income and sales: invoices issued, receipts, cash register tapes, EFTPOS records.
• Expenses and purchases: supplier invoices and receipts, including the GST shown on each.
• GST records: tax invoices supporting every input tax credit claimed on the BAS.
• Payroll: wages, super contributions (with payday super timing from July 2026), PAYG withholding.
• Assets: purchase documents, depreciation schedules, and eventual disposal records.

Reviews work backwards from a claim to its document. The structure that survives them is one where every BAS label and every deduction line can name the specific records behind it, which is an argument for organising evidence by transaction rather than by month or by box.

What this looks like as a workflow

Five years of substantiation is unmanageable as a filing cabinet and trivial as a by-product of digital bookkeeping. The pattern that works:

1. Capture at the moment of spend. Photo, email forward, or drive pick-up on the day the document exists; never let paper accumulate.
2. Attach evidence to the transaction, not to a separate folder. A receipt stored against the ledger entry it supports is findable in a review five years later; a receipt in a shoebox or generic drive folder effectively is not.
3. Code GST treatment at capture. Input tax credit substantiation is the most commonly tested record category for GST-registered businesses.
4. Flag asset purchases so their documents inherit the longer retention they need.

That sequence is ExpenseFlow’s core loop: documents are captured as they happen, extracted and coded with the correct GST treatment, and synced into Xero or QuickBooks Online with the source document attached to the transaction. The 5-year archive assembles itself transaction by transaction, in a form where any line item in the BAS can produce its evidence in two clicks. Nothing about the retention obligation changes; what changes is that meeting it stops being a separate job.